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• W3203792191 endingPage "821" @default.
• W3203792191 startingPage "788" @default.
• W3203792191 abstract "Early Paleozoic ophiolitic mélanges in the Altyn Tagh Orogen, southeastern Tarim, yield a large range of formation ages and geochemical affinities. This study focused on the Hongliugou ophiolitic mélange in the North Altyn Tagh subduction-accretion belt and involved mineral chemical, zircon geochronological, and whole-rock elemental and isotopic investigations of the ultramafic and mafic rocks. In the studied lherzolite samples, Cr-spinel, olivine, and pyroxene show mineral chemistry akin to that of abyssal peridotite. Subhedral-anhedral Cr-spinel grains with high Cr# values (100*Cr/[Cr+Al] of 30–40) and negative oxygen fugacity (fO₂) values represent original spinel formed during mid-ocean ridge basalt (MORB) melt extraction. Other subhedral-anhedral and euhedral Cr-spinel with low Cr# values of < 30 to 20 display a wide range of negative to positive fO₂ values, indicating interaction of peridotite with MORB magma. New zircon U-Pb dating results record ages of <i>ca.</i> 490 Ma for gabbro and <i>ca.</i> 486 Ma for diabase in the Hongliugou ophiolitic mélange. Whole-rock geochemical compositions suggest that the gabbro and diabase samples are tholeiitic and show MORB affinities or transitional affinities between MORB and island arc tholeiite. These mafic rocks might have been derived from a depleted MORB-source mantle that was variably metasomatized by subduction-induced fluids based on their variable Th/Yb, high La/Nb, low Th/Nb, and depleted isotopes (initial ⁸⁷Sr/⁸⁶Sr ratios of 0.703073 to 0.703385 and <i>ε</i>_Nd(<i>t</i>) values of +6.2 to +6.3). New results, when integrated with previous work, clarify that <i>ca.</i> 520 to 510 Ma ophiolites formed in the initial subduction setting and <i>ca.</i> 490 to 480 Ma ophiolites in a back-arc setting. Minor <i>ca.</i> 450 Ma ophiolite probably represents a late phase of ophiolite formation due to the presence of a very minor remnant ocean." @default.
• W3203792191 created "2021-10-11" @default.
• W3203792191 creator A5003485405 @default.
• W3203792191 creator A5034541610 @default.
• W3203792191 creator A5046380471 @default.
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• W3203792191 creator A5069350652 @default.
• W3203792191 creator A5074346386 @default.
• W3203792191 creator A5074471189 @default.
• W3203792191 date "2021-06-01" @default.
• W3203792191 modified "2023-10-18" @default.
• W3203792191 title "Multiphase ophiolite formation in the Northern Altyn Tagh Orogen, southeastern Tarim" @default.
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